Actually, blocktrades had their STEEM & SBD stake forked out in the latest soft fork on the Steem blockchain that Justin Sun and Steemit, Inc. pushed through. It locked the @blocktrades account from doing transfers and other operations.

Justin just stole the stake of an exchange operating an a formerly "decentralized" blockchain.

Now, HIVE is all that matters. Steem is effectively a centralized chain -- witnesses like @blockbrothers who supported Sun and got voted in post-HF23 were immediately unvoted and removed after choosing to not support Justin's latest Hard Fork.